/* @file CustomKeypad.pde
|| @version 1.0
|| @author Alexander Brevig
|| @contact alexanderbrevig@gmail.com
||
|| @description
|| | Demonstrates changing the keypad size and key values.
|| #
*/
/*
 * Kaypad_Basic.ino
 * modified by c.d.odom on June 21, 2020
 * 
 * A basic 4x4 matrix-style keypad app for Arduino. 
 * It utilizes the Keypad.h library, you must first load the library.  
 * Here's how:
 * 1. Find the Keypad.zip file, which contains the library files.  (If you don't have it, you can 
 * download it from my textbook's site at https://www.pcrduino.com/downloads/
 * under Sample Code Downloads >> Extras.)
 * 
 * 2. Then from the menu: Sketch >> Include Library >> Add .ZIP Library... >> (then locate and select the Keypad.zip folder)
 * 
 * 3. Connect the 8 wires of the keypad to 8 pins on the Arduino.
 * Pinout: Hold the keypad so the connecting wires hang down.  (With the Lafvin module the letters on the keypad are upright in this orientation.)
 * The right-most wire should be connected to Arduino pin 2.  The left-most wire connect to Arduino pin 9.
 * 
 * 4. Run the code, open the Serial Monitor, and press the buttons.  The key press should echo on the Serial Monitor.
 * 
 *       KEYPAD PINOUT
 *     ________________
 *     |              |
 *     |  1  2  3  A  |
 *     |  4  5  6  B  |
 *     |  7  8  9  C  |
 *     |  *  0  #  D  |
 *     |              |
 *     ----------------
 *     | | | | | | | |
 *     | | | | | | | |
 *     | | | | | | | |
 *     | | | | | | | |
 *     | | | | | | | |
 *     | | | | | | | |
 *     ^ ^ ^ ^ ^ ^ ^ ^
 *     9 8 7 6 5 4 3 2     <<< Arduino pin numbers
 */
#include <Keypad.h>

const byte ROWS = 4; //four rows
const byte COLS = 4; //four columns
//define the cymbols on the buttons of the keypads
char hexaKeys[ROWS][COLS] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
byte rowPins[ROWS] = {9, 8, 7, 6}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {5, 4, 3, 2}; //connect to the column pinouts of the keypad

//initialize an instance of class NewKeypad
Keypad customKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS); 

void setup(){
  Serial.begin(9600);
}
  
void loop(){
  char customKey = customKeypad.getKey();
  
  if (customKey){
    Serial.println(customKey);
  }
}